Adds empty feature set for cainjector. Parses feature gates in devel

script, and passes them on to each component

Signed-off-by: joshvanl <vleeuwenjoshua@gmail.com>

cmd/cainjector/app/BUILD.bazel

@@ -11,6 +11,7 @@ go_library(
         "//pkg/controller/cainjector:go_default_library",
         "//pkg/logs:go_default_library",
         "//pkg/util:go_default_library",
+        "//pkg/util/feature:go_default_library",
         "//pkg/util/profiling:go_default_library",
         "@com_github_go_logr_logr//:go_default_library",
         "@com_github_spf13_cobra//:go_default_library",

cmd/cainjector/app/start.go

@@ -36,6 +36,7 @@ import (
 	"github.com/cert-manager/cert-manager/pkg/controller/cainjector"
 	logf "github.com/cert-manager/cert-manager/pkg/logs"
 	"github.com/cert-manager/cert-manager/pkg/util"
+	utilfeature "github.com/cert-manager/cert-manager/pkg/util/feature"
 	"github.com/cert-manager/cert-manager/pkg/util/profiling"
 )
 
@@ -88,6 +89,8 @@ func (o *InjectorControllerOptions) AddFlags(fs *pflag.FlagSet) {
 
 	fs.BoolVar(&o.EnablePprof, "enable-profiling", cmdutil.DefaultEnableProfiling, "Enable profiling for cainjector")
 	fs.StringVar(&o.PprofAddr, "profiler-address", cmdutil.DefaultProfilerAddr, "Address of the Go profiler (pprof) if enabled. This should never be exposed on a public interface.")
+
+	utilfeature.DefaultMutableFeatureGate.AddFlag(fs)
 }
 
 // NewInjectorControllerOptions returns a new InjectorControllerOptions

devel/addon/certmanager/install.sh

@@ -25,10 +25,23 @@ RELEASE_NAME="${RELEASE_NAME:-cert-manager}"
 # Default feature gates to enable
 FEATURE_GATES="${FEATURE_GATES:-ExperimentalCertificateSigningRequestControllers=true,ExperimentalGatewayAPISupport=true,AdditionalCertificateOutputFormats=true}"
 
+# As Feature Gates are added/removed, these lists should be updated.
+declare -a FEATURE_GATES_CONTROLLER_ALL=(\
+"AllAlpha","AllBeta","ValidateCAA","ExperimentalCertificateSigningRequestControllers",\
+"ExperimentalGatewayAPISupport","AdditionalCertificateOutputFormats")
+declare -a FEATURE_GATES_WEBHOOK_ALL=(\
+"AllAlpha","AllBeta","AdditionalCertificateOutputFormats")
+declare -a FEATURE_GATES_CAINJECTOR_ALL=(\
+"AllAlpha","AllBeta")
+
 SCRIPT_ROOT=$(dirname "${BASH_SOURCE}")
 source "${SCRIPT_ROOT}/../../lib/lib.sh"
 SCRIPT_ROOT=$(dirname "${BASH_SOURCE}")
 
+FEATURE_GATES_CONTROLLER=$(registered_feature_gates_for $FEATURE_GATES_CONTROLLER_ALL "${FEATURE_GATES}")
+FEATURE_GATES_WEBHOOK=$(registered_feature_gates_for $FEATURE_GATES_WEBHOOK_ALL "${FEATURE_GATES}")
+FEATURE_GATES_CAINJECTOR=$(registered_feature_gates_for $FEATURE_GATES_CAINJECTOR_ALL "${FEATURE_GATES}")
+
 # Require kubectl & helm available on PATH
 check_tool kubectl
 check_tool kubectl-cert_manager
@@ -71,8 +84,10 @@ helm upgrade \
     --set webhook.image.tag="${APP_VERSION}" \
     --set startupapicheck.image.tag="${APP_VERSION}" \
     --set installCRDs=true \
-    --set featureGates="${FEATURE_GATES//,/\\,}" `# escape commas in --set by replacing , with \, (see https://github.com/helm/helm/issues/2952)` \
-    --set "webhook.extraArgs={--feature-gates=AllAlpha=true}" \
+    `# escape commas in --set by replacing , with \, (see https://github.com/helm/helm/issues/2952)` \
+    --set featureGates="${FEATURE_GATES_CONTROLLER//,/\\,}" \
+    --set "webhook.extraArgs={--feature-gates=${FEATURE_GATES_WEBHOOK//,/\\,}}" \
+    --set "cainjector.extraArgs={--feature-gates=${FEATURE_GATES_CAINJECTOR//,/\\,}}"\
     --set "extraArgs={--dns01-recursive-nameservers=${SERVICE_IP_PREFIX}.16:53,--dns01-recursive-nameservers-only=true}" \
     "$RELEASE_NAME" \
     "$REPO_ROOT/bazel-bin/deploy/charts/cert-manager/cert-manager.tgz"

devel/lib/lib.sh

@@ -115,3 +115,24 @@ export_logs() {
   echo "Exporting cluster logs to artifacts..."
   "${SCRIPT_ROOT}/cluster/export-logs.sh"
 }
+
+# join_by joins a list of strings by a string.
+# e.g. `join_by , a b c` -> `a,b,c`
+join_by() {
+  local d=${1-} f=${2-}
+  if shift 2; then
+    printf %s "$f" "${@/#/$d}"
+  fi
+}
+
+registered_feature_gates_for() {
+  declare -a FEATURE_GATES_SUPPORTED=($1)
+  FEATURE_GATES="$2"
+  declare -a FEATURE_GATES_TO_RUN=()
+  for val in ${FEATURE_GATES//,/ }; do
+    if [[ "${FEATURE_GATES_SUPPORTED[*]}" =~ "${val%=*}" ]]; then
+      FEATURE_GATES_TO_RUN+=($val)
+    fi
+  done
+  join_by , ${FEATURE_GATES_TO_RUN[@]}
+}

internal/BUILD.bazel

@@ -13,6 +13,7 @@ filegroup(
         "//internal/apis/certmanager:all-srcs",
         "//internal/apis/config/webhook:all-srcs",
         "//internal/apis/meta:all-srcs",
+        "//internal/cainjector/feature:all-srcs",
         "//internal/controller/certificates:all-srcs",
         "//internal/controller/feature:all-srcs",
         "//internal/ingress:all-srcs",

internal/cainjector/feature/BUILD.bazel

@@ -0,0 +1,26 @@
+load("@io_bazel_rules_go//go:def.bzl", "go_library")
+
+go_library(
+    name = "go_default_library",
+    srcs = ["features.go"],
+    importpath = "github.com/jetstack/cert-manager/internal/cainjector/feature",
+    visibility = ["//:__subpackages__"],
+    deps = [
+        "//pkg/util/feature:go_default_library",
+        "@io_k8s_component_base//featuregate:go_default_library",
+    ],
+)
+
+filegroup(
+    name = "package-srcs",
+    srcs = glob(["**"]),
+    tags = ["automanaged"],
+    visibility = ["//visibility:private"],
+)
+
+filegroup(
+    name = "all-srcs",
+    srcs = [":package-srcs"],
+    tags = ["automanaged"],
+    visibility = ["//visibility:public"],
+)

internal/cainjector/feature/features.go

@@ -0,0 +1,44 @@
+/*
+Copyright 2022 The cert-manager Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package feature
+
+import (
+	"k8s.io/component-base/featuregate"
+
+	utilfeature "github.com/jetstack/cert-manager/pkg/util/feature"
+)
+
+const (
+// FeatureName will enable XYZ feature.
+// Fill this section out with additional details about the feature.
+//
+// Owner (responsible for graduating feature through to GA): @username
+// Alpha: vX.Y
+// Beta: ...
+//FeatureName featuregate.Feature = "FeatureName"
+)
+
+func init() {
+	utilfeature.DefaultMutableFeatureGate.Add(cainjectorFeatureGates)
+}
+
+// cainjectorFeatureGates defines all feature gates for the cainjector component.
+// To add a new feature, define a key for it above and add it here.
+// To check whether a feature is enabled, use:
+//   utilfeature.DefaultFeatureGate.Enabled(feature.FeatureName)
+// Where utilfeature is github.com/jetstack/cert-manager/pkg/util/feature.
+var cainjectorFeatureGates = map[featuregate.Feature]featuregate.FeatureSpec{}